tree e663f9ad21ec99aaab3ca324eb597c6d5a36cd5d
parent ababd7612321bbe89abc87c607ca8d70702d9e56
author Tomasz Figa <tfiga@chromium.org> 1560332208 -0400
committer Mauro Carvalho Chehab <mchehab+samsung@kernel.org> 1561148996 -0400

media: Clarify the meaning of file descriptors in VIDIOC_DQBUF

When the application calls VIDIOC_DQBUF with the DMABUF memory type, the
v4l2_buffer structure (or v4l2_plane structures) are filled with DMA-buf
file descriptors. However, the current documentation does not explain
whether those are new file descriptors referring to the same DMA-bufs or
just the same integers as passed to VIDIOC_QBUF back in time. Clarify
the documentation that it's the latter.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>